frg wrote:This might be Bug 1310814 which was fixed for 2.49 but it is for Sierra.

Check System Preferences - Date & Time - Time Zone and see if City and time zone are ok.

Yes, mine is still 10.11.6 as I mentioned in the first post, I have not upgraded to Sierra (10.12.x) yet. My setting is "Set data and time automatically', the time server is "apple Europe (time.euro.apple.com)"time is also set automatically and it is nearest to the location of UK Birmingham . So what do you mean if they are ok or not?

you said it is fixed for 2.49. where can I download and test it ?thanks.